<!DOCTYPE html>
<html>
    <head>
        <title>Itowns - WebXR Example</title>

        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">

        <link rel="stylesheet" type="text/css" href="css/example.css">
    </head>
    <body>
        <div id="viewerDiv"></div>

        <script type="importmap">
            {
                "imports": {
                    "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.159.0/examples/jsm/"
                }
            }
        </script>

        <!-- Import iTowns source code -->
        <script src="../dist/itowns.js"></script>

        <script type="module">

            import { VRButton } from 'three/addons/webxr/VRButton.js';

            // ---------- SETUP THE VR VIEW : ----------

            // Define camera initial position
            const placement = {
                coord: new itowns.Coordinates('EPSG:4326', 6.227, 45.167),
                range: 15000,
                tilt: 5,
                heading: 62,
            }

            // `viewerDiv` will contain iTowns' rendering area (`<canvas>`)
            const viewerDiv = document.getElementById('viewerDiv');

            // Create a GlobeView
            const view = new itowns.GlobeView(viewerDiv, placement, {
                webXR: { scale: 0.005 },
            });

            // Instantiate three's VR Button
            const vrButton = VRButton.createButton(view.renderer);
            viewerDiv.appendChild(vrButton);

            // ---------- DISPLAY ORTHO-IMAGES : ----------

            // Add one imagery layer to the scene. This layer's properties are
            // defined in a json file, but it could be defined as a plain js
            // object. See `Layer` documentation for more info.
            itowns.Fetcher.json('./layers/JSONLayers/Ortho.json').then((config) => {
                config.source = new itowns.WMTSSource(config.source);
                view.addLayer(new itowns.ColorLayer('Ortho', config),
                );
            });

            // ---------- DISPLAY A DIGITAL ELEVATION MODEL : ----------

            // Add two elevation layers, each with a different level of detail.
            // Here again, each layer's properties are defined in a json file.
            function addElevationLayerFromConfig(config) {
                config.source = new itowns.WMTSSource(config.source);
                view.addLayer(
                    new itowns.ElevationLayer(config.id, config),
                );
            }
            itowns.Fetcher.json('./layers/JSONLayers/IGN_MNT_HIGHRES.json')
                .then(addElevationLayerFromConfig);
            itowns.Fetcher.json('./layers/JSONLayers/WORLD_DTM.json')
                .then(addElevationLayerFromConfig);
        </script>
    </body>
</html>
